CVE-2018-0021

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-13. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

If all 64 digits of the connectivity association name (CKN) key or all 32 digits of the connectivity association key (CAK) key are not configured, all remaining digits will be auto-configured to 0. Hence, Juniper devices configured with short MacSec keys are at risk to an increased likelihood that an attacker will discover the secret passphrases configured for these keys through dictionary-based and brute-force-based attacks using spoofed packets. Affected releases are Juniper Networks Junos OS: 14.1 versions prior to 14.1R10, 14.1R9; 14.1X53 versions prior to 14.1X53-D47; 15.1 versions prior to 15.1R4-S9, 15.1R6-S6, 15.1R7; 15.1X49 versions prior to 15.1X49-D100; 15.1X53 versions prior to 15.1X53-D59; 16.1 versions prior to 16.1R3-S8, 16.1R4-S8, 16.1R5; 16.2 versions prior to 16.2R1-S6, 16.2R2; 17.1 versions prior to 17.1R2.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
47%
KEV
Not listed

Published

April 11, 2018

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated Aug 19, 2026
No patch confirmed yet.
generic

CEC Juniper Community

https://kb.juniper.net/JSA10854
generic
http://www.securitytracker.com/id/1040789

Data Freshness Timeline

(refreshed 6× in last 7d / 21× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 131 total refreshes for this CVE.

  1. 2026-09-07 15:56 UTCEPSS rescore
  2. 2026-09-05 15:24 UTCEPSS rescore
  3. 2026-09-04 13:56 UTCEPSS rescore
  4. 2026-09-04 05:02 UTCEPSS rescore
  5. 2026-09-02 14:07 UTCEPSS rescore
  6. 2026-09-02 14:07 UTCEPSS rescore
  7. 2026-09-01 03:31 UTCEPSS rescore
  8. 2026-08-30 19:13 UTCEPSS rescore
  9. 2026-08-28 21:36 UTCEPSS rescore
  10. 2026-08-27 14:21 UTCEPSS rescore
  11. 2026-08-26 14:41 UTCEPSS rescore
  12. 2026-08-25 13:44 UTCEPSS rescore
  13. 2026-08-23 00:14 UTCEPSS rescore
  14. 2026-08-21 23:44 UTCEPSS rescore
  15. 2026-08-19 16:59 UTCEPSS rescore
  16. 2026-08-18 13:43 UTCEPSS rescore
  17. 2026-08-16 14:51 UTCEPSS rescore
  18. 2026-08-16 02:10 UTCEPSS rescore
  19. 2026-08-15 01:26 UTCEPSS rescore
  20. 2026-08-12 13:46 UTCEPSS rescore
  21. 2026-08-09 13:42 UTCEPSS rescore
  22. 2026-08-08 16:32 UTCEPSS rescore
  23. 2026-08-07 16:22 UTCEPSS rescore
  24. 2026-08-06 13:42 UTCEPSS rescore
  25. 2026-08-06 13:42 UTCEPSS rescore
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  1. 2026-08-05 19:13 UTCEPSS rescore
  2. 2026-08-02 02:23 UTCEPSS rescore
  3. 2026-08-02 02:23 UTCEPSS rescore
  4. 2026-08-01 04:12 UTCEPSS rescore
  5. 2026-07-30 16:24 UTCEPSS rescore
  6. 2026-07-30 01:26 UTCEPSS rescore
  7. 2026-07-28 15:32 UTCEPSS rescore
  8. 2026-07-26 14:51 UTCEPSS rescore
  9. 2026-07-26 14:51 UTCEPSS rescore
  10. 2026-07-23 14:15 UTCEPSS rescore
  11. 2026-07-23 01:31 UTCEG score recompute
  12. 2026-07-22 22:11 UTCEG score recompute
  13. 2026-07-22 14:04 UTCEPSS rescore
  14. 2026-07-21 15:21 UTCEPSS rescore
  15. 2026-07-20 17:04 UTCEPSS rescore
  16. 2026-07-20 17:04 UTCEPSS rescore
  17. 2026-07-19 14:28 UTCEPSS rescore
  18. 2026-07-19 14:28 UTCEPSS rescore
  19. 2026-07-19 02:26 UTCEPSS rescore
  20. 2026-07-19 02:26 UTCEPSS rescore
  21. 2026-07-18 10:01 UTCEPSS rescore
  22. 2026-07-16 16:59 UTCEPSS rescore
  23. 2026-07-16 16:59 UTCEPSS rescore
  24. 2026-07-15 16:55 UTCEPSS rescore
  25. 2026-07-15 16:54 UTCEPSS rescore
  26. 2026-07-15 01:56 UTCEPSS rescore
  27. 2026-07-15 01:56 UTCEPSS rescore
  28. 2026-07-13 22:26 UTCEPSS rescore
  29. 2026-07-13 22:26 UTCEPSS rescore
  30. 2026-07-12 05:43 UTCEPSS rescore
  31. 2026-07-11 08:24 UTCEPSS rescore
  32. 2026-07-09 19:06 UTCEPSS rescore
  33. 2026-07-08 15:11 UTCEPSS rescore
  34. 2026-07-07 13:42 UTCEPSS rescore
  35. 2026-07-06 16:24 UTCEPSS rescore
  36. 2026-07-06 16:24 UTCEPSS rescore
  37. 2026-07-06 02:20 UTCEPSS rescore
  38. 2026-07-06 02:20 UTCEPSS rescore
  39. 2026-07-05 02:27 UTCEPSS rescore
  40. 2026-07-04 06:28 UTCEPSS rescore
  41. 2026-07-04 06:28 UTCEPSS rescore
  42. 2026-07-02 16:54 UTCEPSS rescore
  43. 2026-07-01 15:03 UTCEPSS rescore
  44. 2026-06-30 23:19 UTCEPSS rescore
  45. 2026-06-30 23:19 UTCEPSS rescore
  46. 2026-06-29 14:03 UTCEPSS rescore
  47. 2026-06-28 14:04 UTCEPSS rescore
  48. 2026-06-28 04:53 UTCEPSS rescore
  49. 2026-06-28 04:53 UTCEPSS rescore
  50. 2026-06-27 03:06 UTCEPSS rescore
  51. 2026-06-25 13:47 UTCEPSS rescore
  52. 2026-06-24 14:02 UTCEPSS rescore
  53. 2026-06-24 14:02 UTCEPSS rescore
  54. 2026-06-23 21:30 UTCEPSS rescore
  55. 2026-06-23 21:30 UTCEPSS rescore
  56. 2026-06-22 14:23 UTCEPSS rescore
  57. 2026-06-22 14:23 UTCEPSS rescore
  58. 2026-06-21 14:54 UTCEPSS rescore
  59. 2026-06-21 14:54 UTCEPSS rescore
  60. 2026-06-21 01:57 UTCEPSS rescore
  61. 2026-06-21 01:57 UTCEPSS rescore
  62. 2026-06-19 19:23 UTCEPSS rescore
  63. 2026-06-19 19:23 UTCEPSS rescore
  64. 2026-06-18 17:50 UTCEPSS rescore
  65. 2026-06-17 17:50 UTCEPSS rescore
  66. 2026-06-16 17:50 UTCEPSS rescore
  67. 2026-06-15 17:45 UTCEPSS rescore
  68. 2026-06-14 23:14 UTCEPSS rescore
  69. 2026-06-14 23:14 UTCEPSS rescore
  70. 2026-06-13 22:58 UTCEPSS rescore
  71. 2026-06-13 22:57 UTCEPSS rescore
  72. 2026-06-12 23:09 UTCEPSS rescore
  73. 2026-06-12 23:09 UTCEPSS rescore
  74. 2026-06-11 13:57 UTCEPSS rescore
  75. 2026-06-10 22:15 UTCEPSS rescore

Frequently asked(5)

What is CVE-2018-0021?
CVE-2018-0021 is a high vulnerability published on April 11, 2018. If all 64 digits of the connectivity association name (CKN) key or all 32 digits of the connectivity association key (CAK) key are not configured, all remaining digits will be auto-configured to 0. Hence, Juniper devices configured with short MacSec keys are at risk to an increased likelihood that…
When was CVE-2018-0021 disclosed?
CVE-2018-0021 was first published in the National Vulnerability Database on April 11, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-0021 actively exploited?
CVE-2018-0021 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 53.0% of all scored CVEs.
What is the CVSS score of CVE-2018-0021?
CVE-2018-0021 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2018-0021?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-0021, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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